End‑Fed & Long‑Wire HF Antennas

Terminated End Fed Vee Antenna (TEFV)
The TEFV is a terminated end‑fed Vee antenna intended for broadband HF coverage with minimal retuning. By accepting some efficiency loss in exchange for wide bandwidth and a quieter noise floor, it becomes a strong choice for multi‑band HF monitoring and casual operating. The article covers geometry, termination values, matching network and practical test results.

Multiband Half Wave End Fed Antenna
This multiband EFHW antenna uses a 1:49 transformer and carefully chosen wire length to cover several HF bands from a single feed point. It targets small‑plot or portable QRP operators who want 80 through 10 metre coverage with minimal hardware. Construction details, winding instructions and on‑air performance observations are provided for easy replication.

Building End Fed Half Wave Antenna (EFHW) for 40M – 10M
A practical EFHW focused on 40 to 10 metres gives solid multiband capabilities with a simple transformer and single wire. This project walks through transformer design, wire‑length tables, support options and tuning in real‑world conditions. It is aimed at portable, balcony and field operators who need quick deployment and predictable tuner behaviour.

Tree Mounted Quarter-Wave Vertical Antenna
The tree‑mounted quarter‑wave vertical shows how to hide an efficient HF radiator in plain sight by strapping it to an existing tree. Radials or counterpoise wires complete the system, giving low‑angle radiation for DX while remaining visually stealthy. The article explains mechanical fastening, wire routing, matching and on‑air performance from a typical suburban lot.

Antenna – Folded Beverage Antenna for HF Bands
This folded Beverage antenna is a receive‑only design built for serious HF DX listening with excellent noise rejection. It uses a long, low wire with specific folding and termination to achieve directional gain at low angles. The guide explains impedance, matching a 450‑ohm line to coax, termination design and how to protect the load from accidental RF power.

Rockloop & Loop‑Style HF Antennas

Rockloop & Loop‑Style HF Antennas

Antenna – Rockloop HF Antenna for 10,15,20 metre ham bands
The Rockloop is a compact multi‑turn HF loop aimed at 10, 15 and 20 metres, built from readily available tubing and a variable capacitor. It offers good efficiency from very small spaces with strong rejection of local noise, making it ideal for urban operators. The article walks through dimensions, mounting options and tuning methods so you can replicate the results.

Antenna – Foldaway Loop Antenna
This foldaway loop is designed for hams who travel or operate portable but still want serious HF capability. The loop collapses flat for storage yet can be deployed quickly in hotel rooms, balconies or rentals. The build covers mechanical hinges, conductor layout and tuning, showing how to achieve multiband coverage while keeping the antenna visually discreet.

Terminated Mini Loop Antenna: Small Space Ham Radio Antenna
The terminated mini loop trades raw efficiency for broadband coverage and low noise in very restricted spaces. Using a resistive load and compact loop, it covers a wide swath of HF without retuning, which suits SDR monitoring and casual HF listening in noisy apartments. The article details component choices, impedance matching and measured performance.

Loaded Loop Antenna – A Practical Balcony HF Solution
This loaded loop wraps an HF radiator around a balcony perimeter, using inductive loading to fit several bands into a compact rectangle. It’s aimed at operators with strict space or visual constraints, but who still want voice and digital contacts. The build shows mechanical mounting tricks, loading‑coil design and SWR results achieved from a real apartment installation.

HF Delta Loop Antenna
The HF delta loop is a full‑wave wire loop arranged in a triangular shape for improved low‑angle radiation and reduced noise pickup. It can be fed for different polarizations and offers a noticeable improvement over simple dipoles for DX work. The article explains dimensions, feed‑point options, matching techniques and real on‑air comparison results.

Aperiodic Multiband Wire Antenna: A Simple and Effective Design
This aperiodic multiband antenna is a non‑resonant HF wire using resistive termination and a broadband transformer for wideband coverage. It is ideal for SDR spectrum monitoring, utility listening and multi‑service monitoring where convenience trumps efficiency. The write‑up explains design theory, construction, measured return loss and when this approach beats traditional resonant wires.

3-Band HF Antenna: A Simple, High-Performance Design

3-Band HF Antenna: A Simple, High-Performance Design: Discover how to build a reliable 3-band hf antenna for 40m, 20m, and 10m. This modification uses an asymmetrical dipole and a toroid balun to deliver better SWR

Low-Loss Feedline on a Budget: Building 450 to 600 Ohm DIY Ladder Line from Common Materials

Low-Loss Feedline on a Budget: Building 450 to 600 Ohm DIY Ladder Line from Common Materials: A complete technical guide to DIY ladder line for amateur radio. Build 450–600 ohm open-wire feedline cheaply, with less loss than coax on any HF band.

VHF DXing Secrets: The Ultimate Guide to Tropospheric Ducting for Radio Hams

Ever heard signals travel hundreds or even thousands of kilometers beyond line-of-sight? That’s not magic—it’s tropospheric ducting.

This fascinating radio phenomenon happens when atmospheric conditions (like temperature inversions and high-pressure systems) bend and trap VHF/UHF signals, letting them travel far beyond their normal range.

For ham radio operators, this means unexpected DX contacts, strong distant signals, and sometimes even interference from stations you’d never normally hear.

If you’re into radio, propagation, or just curious how the atmosphere can act like a giant waveguide, this guide is worth your time:

🔗 https://vu3dxr.in/ultimate-guide-to-tropospheric-ducting-for-radio-hams/

27MHz AM Transmitter Circuit for hobbyists

Explore the classic 27MHz AM Transmitter circuit. Learn about its oscillator, modulation, and power stages to build your own radio projects.

The 27MHz frequency band has long been a favorite among electronics enthusiasts and amateur radio operators. This citizen’s band frequency offers excellent propagation characteristics and serves as an ideal starting point for understanding amplitude modulation (AM) transmission principles. Today, we’ll explore a well-designed 27MHz AM transmitter circuit that demonstrates classic RF engineering concepts while remaining accessible to hobbyists.

27MHz AM Transmitter Circuit for hobbyists: 

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The Silent Revolution: DRM+ Radio in the FM Bands: Discover how DRM Radio in FM Bands revolutionizing global broadcasting in 2026. From xHE-AAC technology to "Green Radio" movement..DRM+ Radio in the FM Bands